Heatmap with unwanted vertical lines

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Sylvain Munaut 246tnt at gmail.com
Thu May 12 07:04:35 UTC 2016


Hi,

> Are these lines to be expected?

Yes, those dongle are cheap for a reason and so they're have DC offset
and 1/f noise near the edges and non-flat frequency response.

So whatever bandwidth you choose you'll always "see" them, just with a
different intensity.

Cheers,

   Sylvain



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